Particle-containing fibrous web

D - Textiles – Paper – 04 – H

Patent

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Details

D04H 1/56 (2006.01) A62B 7/10 (2006.01)

Patent

CA 2585710

A porous sheet article comprising a self-supporting nonwoven web of polymeric fibers and at least 80 weight percent sorbent particles enmeshed in the web, the fibers having sufficiently greater elasticity or sufficiently greater crystallization shrinkage than similar caliper polypropylene fibers and the sorbent particles being sufficiently evenly distributed in the web so that the web has an Adsorption Factor A of at least 1.6 X 104 /mm water. The articles have low pressure drop and can provide filter elements having long service life and an Adsorption Factor approaching and in some instances exceeding that of a packed carbon bed.

L'invention concerne un article en feuille poreux comprenant une nappe non tissée autoportante de fibres polymères et au moins 80 % en poids de particules sorbantes enchevêtrées dans la nappe. Ces fibres présentent une élasticité suffisamment forte ou un rétrécissement à la cristallisation suffisamment supérieur à celle des fibres de polypropylène d'une épaisseur semblabe et les particules sorbantes sont réparties de manière suffisamment égale dans la nappe de sorte que la nappe présente un facteur d'adsorption A d'au moins 1,6 X 104 /mm d'eau. Les articles présentent une faible perte de pression et peuvent constituer des éléments de filtrage ayant une longue durée de vie utile et un facteur d'adsorption approchant voire, dans certains cas, dépassant celui d'un garnissage en carbone.

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